[lwip-users] help me please

[见永 吴]

Hi all:
    This is the first time i come here ^_^.
    Now i am porting lwip over Arm+ucos and version of
lwip is 1.1.0.I have many problems
 and need your help!
    First,in header file debug.h,there are such
definitions about LWIP_ASSERT and LWIP_DEBUG
as follows:
         #ifndef LWIP_NOASSERT
         #  define LWIP_ASSERT(x,y) do { if(!(y))
LWIP_PLATFORM_ASSERT(x); } while(0)
         #else
         #  define LWIP_ASSERT(x,y) 
         #endif

       #ifdef LWIP_DEBUG
       /** print debug message only if debug message
type is enabled...
          *  AND is of correct type AND is at least
DBG_LEVEL */
       #  define LWIP_DEBUGF(debug,x) do { if
(((debug) & DBG_ON) && 
         ((debug) & DBG_TYPES_ON) && 
          ((int)((debug) & DBG_MASK_LEVEL) >=
DBG_MIN_LEVEL)) 
      { LWIP_PLATFORM_DIAG(x); if ((debug) & DBG_HALT)
while(1); } } while(0)
     #  define LWIP_ERROR(x)   do {
LWIP_PLATFORM_DIAG(x); } while(0)  
      #else /* LWIP_DEBUG */
      #  define LWIP_DEBUGF(debug,x) 
      #  define LWIP_ERROR(x)  
      #endif 
  Here,i can't find the detail definiton of
LWIP_PLATFORM_ASSERT function and LWIP_PLATFORM_DIAG
in source file.Must i 

implement them by myself?If i must,how to implement
them and in which file?
  Second, can someone give me an examle of ethernet
driver?
  Thank you!







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